Central Bureau for Astronomical Telegrams
IAUC 6441: 1996am; V1974 Cyg; 57P
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 6442
.dvi or
.ps format.
Circular No. 6441
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)
SUPERNOVA 1996am IN ANONYMOUS GALAXY
The Mount Stromlo Abell Cluster Supernova Search Team (cf.
IAUC 6418) reports the discovery of a supernova on CCD images taken
by S. Chan on the Mount Stromlo 1.27-m telescope (+ Macho Camera).
SN 1996am is located at R.A. = 21h46m07s.48, Decl. = -44o00'12".7
(equinox 2000.0), which is near the nucleus of the host galaxy
(itself situated near Abell 3809). A nearby star of mag 12 is at
R.A. = 21h46m12s.57, Decl. = -43o58'51".3. SN 1996am is visible on
CCD images taken on July 12 at V approximately R approximately 19.0,
and it was not detected on similar frames taken on July 3. A
spectrum (range 350-1000 nm) obtained on July 25 with the MSSSO
2.3-m Imager + Grism shows that this is a type-Ia supernova near
maximum. The host galaxy's redshift, measured from H-alpha
emission at the position of the supernova, is z = 0.065, which is
coincident with the redshift of Abell 3809 (z = 0.062).
V1974 CYGNI
S. Balman, J. S. Gallagher and M. Orio, University of
Wisconsin at Madison, report: "Using the Kitt Peak 3.5-m WIYN
telescope (+ CCD imager) on May 27 UT, we detected an H-alpha
nebulosity associated with the classical nova V1974 Cyg (N Cyg
1992). The faint, diffuse, H-alpha emission around the nova had
dimensions in each direction as follows: north, 125"; south, 190";
west, 140"; east, 142". An elliptical cavity was also prominent
around the nova, extending as follows: north, 100"; south, 21";
west, 35"; east, 38". The H-alpha nebulosity was found to peak in
the southwest from a region 152" x 208" with long, thin, chevron-
like filamentary structures. The size of the nebulosity is
consistent with light travel time arguments for a reflection nebula.
Our observation confirms the previous spectroscopic result of
extensive H-alpha emission from the vicinity of the nova by Rosino
et al. (1996, AAp, submitted). On June 16, the nebulosity showed
no substantial changes; the narrowband H-alpha luminosity of the
nebula in the June observation is 2-3 times that of the nova, which
also showed a shell diameter of 0".8 with an extension to the
northwest."
COMET 57P/DU TOIT-NEUJMIN-DELPORTE
This comet is in outburst; m1 estimates: July 24.78 UT, 13.3
(A. Nakamura, Kuma, Japan, 0.60-m reflector + CCD); 26.08, 13.3 (H.
Mikuz, Ljubljana, Slovenia, 0.20-m reflector + CCD + V filter);
26.45, 11.8: (A. Hale, Cloudcroft, NM, 0.41-m reflector, visual);
28.04, 11.9: (M. Plsek, Lelekovice, Czech Republic, 0.35-m
reflector, visual).
(C) Copyright 1996 CBAT
1996 July 29 (6441) Daniel W. E. Green
Read IAUC 6442
.dvi or
.ps format.
Our Web policy. Index to the CBAT/MPC/ICQ pages.
